Ouch, that sucks. I don't happen have a 27.2 in my junk bin right now or I'd be happy to oblige.
This might help with the sizing to be more sure. 27.2 isn't all that "standard" in the long run.
A simple seat post is not a super-expensive part and most LBS's carry a decent selection of economy seat posts. I'd suggest also getting at least an alan-head seat post binding bolt for more security. That at least discourages the opportunist thieves/kids from a 2-second yank and run attack. On my bike I've also got a chain securing the Brooks but anyone with a bolt-cutter or bike chain-breaker could easily defeat that too. Even a pin-lock binder isn't proof against a thief who knows his stuff.
I have a 27.2 with an old road bike saddle on it. It's yours if you want it.
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